Pump.



W. O. CROCKER.

PUMP

APPLICATION FILED JULY 21, 1013.

1,1 lfififi Paten ted Nov. 24, 1914. I Z SHEETS-SHEET 1.

A TTOR NE Y.

W. 0. CROGKER.

PUMP.

APPLICATION FILED JULY 21,1913.

Patented N0v.24,1914.

2 SHEETS"SHEET 2.

WITNESSES:

IN VEN'IOR Malia/7a Q amvl'e'r: By 4/ 1%; Lb/ M ATTORNEY.

WILLIAM C. CROCKER, 013' NORTH ADAMS, MASSACHUSETTS.

Pill/II.

Spcciflciition of Letters Patent.

But on ted Nov. 24, 19114:.

Application filed July 21, 1513. Serial No. 780,112.

T (ZZZ til/1071b it may concern:

Be it known that I, WILLIAM O. Cnocetnn,

a. citizen of the United States of Ai'uerica, only residing at North Adams, in the county of Berkshire and State of Massachusetts, have invented new and useful improvements in Pumps, of which the following is a specification.

This invention relates to a pump and more; particularly to a rotary water pump forQgcncral application and specifically adapted for use as an element in an automobile lire pump.

While in many of its broad features my new pump resembles the old. pump, by certain changes in the arrangement and con stri'iction of the parts and by certain refinements of des' n I have considerably increased its clliciency and speed without in the least, atlecting the complexity of its pan-ts. v

Among the important advantages of my new pump, 1 may enumerate the following points: First, the abutments which are swept by the tips of the teeth of the rotors are in my new pump extended inwardly toward ouch other sofas to control the size and shape of the discharge outlet. Second, these abutments, while standardized, for any given pump, as to the shank and the arm contiguous to the pump wall, may vary widely as to the inwardly extending arm, so that by replacing merely the abutments the size and contour of the discharge port may be radically altered.

The result oi determining the size and shape of the discharge port by means of replaceable ubutmcnts is of farreaching importance; No adequate method of ascertaining the proper shape for the exhaust passage of a rotary pump is known except that of fcutting and trying. In. all rotary puznips exceptlmine this must be done by rebuilding the pump or at least the pump easing. This is tedious and almostprohibiitively eXpcnsiVo. Th my pump the abutments only need to be altered. But this is not the sole advantage of my device. The best shape and size for the discharge pas sage depends upon the class of Work which the pump does. \Vhen, as is often the ease, the pump is used at one time to furnish a. small high pressure stream, and at another time a large low-pressure stream, discharge passages of different design are desirable. Ilerotofore if the pump user demanded ellipcrl'ectly scaled eicncy .l'or both high and low-pressure W(')ll he bought two pumps. With my pump he needs two sets of abutments.

Other advantages will appear as the de tailed description to follow proceeds.

In the drawings,---l igure .1 is an clevutron of my pump with one of the casing plates tl'icrcol' removed; Fig. 2 is a similar partial View shoivhn, a variation in the arrarngeniont of the uhutments; Fig. 3 is a plan View of the pump; and Fig. t is an elevation of the casing showing}, the ballle-plates.

is the casing comprising suitable side. top, and bottom plates bolted together substantially as in the old construction. The two side plates of the casing, 2 and 3, .izw: provided with bearings for the shafts 4 and 5,-thcse shafts being provided at one end with iutermeshing gears 6 and the shaft 5 being provided at the other end with a driving pinion or gear i.- Tt will thus be seen that the drive of the cntirelyirom without the casing and that therefore the rotors to be hereinafter de scribed have no driving, or pushing action one upon the other Whatever. Each of the casings 2 and 3 is [n'ovided with a bailleplate or bathe-section This element of the machine may comprise a separate plate in the nature of a Washer, but is preferably made integral with each side casing, as shown in Fig. 4. Tu contour it comprises two substantially keyshaped parts 9 connected as shown at 10. Its form is such that the rotors 11 and 12 being at all times in contact upon either sidewvith its bullleplates and the abutments l3 and 14, divide. the interior of the easing into two nonconinuinicable chambers, one thereof comprising that part of the easing lying principally beneath and to the right and left of the ballle-platc S and accessiblethrough the inlet port of the pump, and the other part con1- rising, broadly, that part of the casing .ying above and between the projections J of the lJiIllle-Plilt-QS- It is to be particularly noted that in the operation oithe pump there aroalways two teeth of the rotors l1 and, 12 meshing over section 10 of the bulllc-plates and moreover that there is always at least one tooth of the corresponding rotors l1 and 12 lying over the extensions 5) upon the ballle-plates 8. lly this construction, while I have made a and \\flt8l'-tl{ fllt pump, I have made it possible to machine only so pump proper is effected ti U Inc

f the interior of the side casings as ,..ns the bnll'l.-plates S, the finish of the the interior of the casing being U11- casing in my new construe and is provicleil with e lo and. 1.6 between which is iocnteci 1 poixt 1'1. in these keynnys sin. nicks 18 end. 19 oi. the (ll) tnients and. it Whiflll cooperate with rotors These clmtments are set to acouy adjusted post 'on by the set-screw 20, us shown. The ohutrzicnts 13 and 1% are of s stunticliy 'l' iorm. and their shanks are engaged in lteyoveys in the casing.

The iibutnients 13 and extend toward. LtCi'l other, partly OifihllllPPlIlg the opening in the casing through which the pump disclnn-ges, so that the size and shape of the outlet. is ilctcrn'iined by, and, may be altered by changing, the contour of the inward arms the 51 bntinents.

Tilt rotors l1 and 1'12- in'e in my new pump trot-meal with teeth out at the cycloiclal v ese curves being so lesignotl that in the operation oi? the pump the interines itions of the two engage at 2 times Win-i a rolling and. not a scooping, grintling oontuctf it is obvious that this it results in a tremendous tlimi" it will n1 lUll of wear upon the parts, tor

'- lilj omi'cnt that musn'mch es the and 5 are positively driven ii 1 o in v; ithoilt the casing and that therefore the rotors have themselves no driving action one upon the other in operation, the pump runs smoothly along without the slightest friction between the rotors.

Fig. shows :1 modification adapted for it still Wider range of control by means of variation in the inward arms of the abut- I'llbl'lL-o'.

Many modifications may be made in the precise form and arrangement shown, and all such as do not depart from the spirit and scope of my invention I purpose to cover in the following claims.

What 1 claim is z I It. It rotary pump comprising in combi; nation, a casing having inlet and outlet openings, pa 'nllel side plates and it connecting wall, shafts having rotors thereon, provided with intcrmeshing teeth, abutments cooperating with the rotors and having in- Warclly extending arms which partly overlap the discharge opening in the casing and (leteri'nine the discharge port of the pump,

2. A rotary pump, comprising abutments cooperating with the rotors and overlapping the exhaust opening" in the casing, and (le- "ermining the discharge port.

rotary pump having replaceable sbutmcnts for determining the outlet port.

/VILLIAM O. CROGKER.

i /itnesses i i (l. H. \DEAN, JEAN lil'zioLmN. 

